Juvenile

[joo-vuh-nl, -nahyl] /ˈdʒu və nl, -ˌnaɪl/

adjective
1.
of, pertaining to, characteristic of, or suitable or intended for young persons:
juvenile books.
2.
young; youthful:
juvenile years.
3.
immature; childish; infantile:
His juvenile tantrums are not in keeping with his age.
noun
4.
a young person; youth.
5.
Theater.

6.
a book for children.
7.
Ornithology. a young bird in the stage when it has fledged, if altricial, or has replaced down of hatching, if precocial.
8.
a two-year-old racehorse.
/ˈdʒuːvɪˌnaɪl/
adjective
1.
young, youthful, or immature
2.
suitable or designed for young people: juvenile pastimes
3.
(of animals or plants) not yet fully mature
4.
of or denoting young birds that have developed their first plumage of adult feathers
5.
(geology) occurring at the earth’s surface for the first time; new: juvenile water, juvenile gases
noun
6.
a juvenile person, animal, or plant
7.
an actor who performs youthful roles
8.
a book intended for young readers
adj.

1620s, from Latin iuvenilis “of or belonging to youth,” from iuvenis “young person,” originally “young” (cf. French jeune; see young). Juvenile delinquency first recorded 1816; Juvenile delinquent the following year.